8th Grade Geometry Help?

The base is 34.4, and the height is 55.5, so we'll use the pythagoreum theorum to find the length of the sides. Since the pythagoreum theorum only works with right triangles, we'll divide the base in half, so it's 17.2. The pythagoreum theorum is a� + b� = c�. Replace a and b with 17.2 and 55.5 so it's 17.2� + 55.5� = c�. Square them, so it's 295.84 + 3080.25 = c. That makes 3376.09 = c, which makes c� = 58.1, which is the answer.